Apparatus for promoting the circulation of water in steam boilers



R. BROWN APPARATUS FOR PROMOTING THE cIRCpLATIoN OF WATER IN STEAM BOITAERS I5 2 Sheets-Shet 1 fibedfirowni Fwd July 21. 192 q July 7, 1925. 1,545,303

R. BROWN APPARATUS FOR PROMOTING THE CIRCULATION OF WATER IN STEAM BOILERS 2 Sheets-Sheet 2 bvenior 1 UNI ED QSTAT Bonner BROWN, F GLASGOW, "swamp. I

Patented July 7, 1925.

ParENro-F APPARATUS FOR ,iinoivrori ve 'rHn cmcunarronf or' wilesam smm ,B'QILERSJ.

Application fi ld. .nn "2'1,

Toall'wh om it mayboncem:

i Be it known that LROBERT BROWN, of 76 Barfillan Drive, Cardonald, Glasgow, Scot-, land, a subject of the King of Great Britain, have invented certain new and useful Improvements in Apparatus'for Promoting the Circulationof 'Water in Steam Boilers, of

which the following is a specification.

This invention relates to apparatus for promoting the circulation of waterin steam boilers, the apparatus being of the type culation is set up before the main circulation. can bejset'up' to discharge water, as usual, from the apparatus above the water level of the boiler. j I

The primary local circulation commences very rapidly after the lighting of the boiler fires and long before the said main circulationis possible, and will continue when the r culation.

fires arebanked and the heat generated is insufiicient to maintain thesaid 'Inain' cir- The invention, including certain details V construction and combinations of parts, will now be described as embodied in a watercirculating apparatus suitable for use with a marine boiler, butit is to be understood that this is by way-of exemplification and not of limitation.

In the accompanyingdrawings f Fig-Ids: an end sectional elevation of a marineboiler having the apparatus in place;

Fig. 2 isaside sectional elevation of part of the boiler shown in 1;, 7 v

Fig. 3is a view similar to Fig. 1 butshowing a modified form of apparatus;

Fig. 4 is an elevation ofthe bell mouthed collector and Fig. 5 is a plan of the parts shown in Beferringto Figs. land 2, the boiler 1 of the usual marine type has three furnaces 1923.; Serial no. 653,015.

2 and three nests of tubes The water cirQ 'culating apparatus is indicated generally as A and comprises a circulator tube 4 in the water spacebetween adjacent nests of tubes."

It is secured to the stayrods of the boiler well into the steam space 11 ofthe boiler,

and is closed by a "cap'12 to'resist leakage of air or steam. The lower end of the circulator tube 4 ends in a collector lg for the rising water, which -c'ollector 'is located asto be in the path of the rising waterwhen the boiler isfheat'ed. I fthecrown iscorclosely adj acent -to the crown'of a furnace so rugated'the end of the collectorshould be U shaped correspond."

A branch 1 10f the tubefl extends from well below the waterline to a point just above the working water level, its upper or 15. v i A dip pipe 16 is" secured at 7 by a'clamp 10 to a boiler sta rod. The upper end of the dip' 'pipe leads into the collector 13: and.

discharge end being tormed as a goose neck forms a" nozzle '17 while'thef lower endcar- 'ries a strainer. '18 which located in the'dead I water space. v t

In the construction shown in Figg'3 the circulatortube 4 ends in afork 19 each branch'ofi which ends in*'a"collector 13.

cent "furnace crown. g

It will 'be' noted that the upper closed portion of the circulator tube 4 forms a' chamber 20 in which air or steam or both Each, collector is loc'ated'close' to aniiadjafis imprisoned between the'cap l2 a'ndthe water in' the tube. Also, the branch '14 is of much smaller-diameter than the tube' l.

' "The collector '13 m'ay'b'emade of zinc or may be zinc linedin which case some for all of the usual zinc plates in the boiler maybe dispensed withf", I V It will be seen that with the present construction the apparatus will not become 'air 0r. steam bQund. I r

' Operation Whenth'e furnaces are fired the 'waterin the confined space of the collector '1-3' circulates much more quickly than in theboiler and this local' circulation quickly induces even if thefires are banked. afsmall local flow of cold water from the dip p lm-' into the circulator tube l. ,Itis found that circulation'itakes place fromthedeadwater sp sm i I l As the. heat of h gemi ody f Wa r,

' adjacent to the furnace crown increases,

' steam is formed and enters the collector 13 thus increasing the rate ofcir'culation in t'he tub 4: unt finally th whole ofthe. Wat r in the tube "is heated, after whiclfst'eam will passup through the heated ater into the compression chamber 20. As a result,

. gooseeneelt l5,-

the Waterinthetuhe 4 is depresserlf belowthe generalwater level of the, boiler amid-the main 'CflflllitiMIl eemm neea t nett stream of wate being diseharged fro the As soon as the discharge commences from the branch 141 an increased suction efiect Y s predated upon the H T 14k l a d m re V spa e.

apid fl w t am. th -dead Wa er spate e 1 This ac on ten imle Wh l tt am i n 'l e if he res ar ba ked ther will stillrb he loeal eireul ti n t s described, thi wi l e inu so long a there isthe necessary difference in temperature b tweeethe W t adjae n o the collector 18 and the Water in the dead-Water The theory of :operation is as follows: Owing to the size of th ,eollector the team ah e th aate 'le el' the tube '4;

v Wouldbe greater in amount than the steam above h te t f thewat r P unit etae sinee this ste m elt betenfiil d in compara ively leng ar ew pr jeetion te ubealee e he at r l e t ail-lat ena le to. spread ut imme iate y with the ns quence that the pressure Within the open upp r ndef he tube w ld e s eht re ee then he g ne al m a ur n he s am ras Consequently, the Water in'the tub e 4 would be s ightly d pressetlbele t elg ee al water level and as'a consequence would lit'tthfl water in the branch '14 above the-general water level since the slight excess pressure would be operating upon a very 1.1111911,

smaller area in the branch 14. V

' Regarding the Closed top construction, the

' pressurein the upper part ofthe tube 4 er aljwater level, the water therein is disp'charged and is discharged in a constant stream and rnot a pulsating stream.

Owing to the large area of the collector 1n comparison With the area of the tube 41,

' t nt sa: l l

Wat r eire atme' apparatus fo l a he a lment o tea tensed w l mally be sufficient to raise the Water in the tube considerably above the temperature of the Water infthe rest of the boiler and the e es amo nt .Qteteem s apparen y i t ficient to warm the Water drawn up by the dip pipe to an adequate extent. It will be noticed that the area of the dip pipe is in its turn very much less than the area of he tube. 9 he sa e are ments woul em t p ly hetere the 12 i er w actua ly iatetlu ipgiste in, he coll c or permitti g comparatively large quantity oit' heated a r te ri e etheltabe tt I will b appreeie etl-tll such as eP-- p is rety simple; and may e. r a ly put inizcplace, Further, it Comefiilltp action very quickly after the boiler fires are l]? ghterl e atimtes Whee he tires. are banke tland the main "circulation helhea generated s i sufliei nt to in mate,

' H v n ne f. 11. d semlee my mete What I claim and desire to secure-thy Letters 7 7 team jheile whi h s e atained Whelly wi n "t ebo er and ep rated with lit ng' e reulet r tube havingi open, end e ated' mm d ately l-1' wen and. en n ow rd the wn er a lttu ae atthe pa of mtri lnum i it a eat, the upa teild o the reala er tube e te ding nte't-he s eals I raeee h ile aleel be ng dos d, breath. it m the eire t te e eet es int the steam pa e a d adip pin xtendin eat the dead Water spaceo'f the-belle, into the l 7 r a e d a th e reule rt lze aet'b iea l ss iam te thaesueh peaead Q fthe.

tube-1'. c e

st am boile W th s eqetaine Ql i 2- Web r irelila i g apparatus f 2a 7 i ie th boil and i opera d Withatitfie use of means external thereto compris ng, in Qollll ll l fil'lfill, an, epea-m tlthetl fitted e 1- lector openingftowartl and lo'oated 1111111Qd1- l ely d ac nt the ere e t iyrna e t he pat at me imemi it-ia ee atli aeie e tll ree V l. c spa iet h eell ete an p ss ng hatinto, a circulator tube lea ing npwards from thecollector into the steam space of dead water ham dip Pi tlie pataithe apper end or the o liro ulator tube being closed andjalbranoh therefrom e s adin ei warcle' in o h anijs'paee' lv i e ile in [a pa atu 91." steam boiler i which. lie, containerl' wholly within the.looile and is operated Without-the use ojiineans' external thereto comprising,

in combination, an op'en mouthed flared polle ter epe lilig o rd and h at m ately adjacent the crown of a furnace'at the extendin atWai dly .f m e. t'wa space into the' collector and passing thererein-1; efm mum i i a e a ip-"P p 1 into, a circulator tube leading upwards from the collector into the steam space of the boiler, the upper end of the circulator tube being closed and a branch therefrom also leading upwards into the steam space, said branch being shorter than said circulator tube.

4. Water circulating apparatus for a steam boiler which is contained wholly within the boiler and is operated without the use of means external thereto, comprising an open-mouthed flared collector opening toward and located immediately adjacent the crown of afurnace at the point of maximum initial heat, a dip pipe extending upwardly from the dead water space into the collector and passing thereinto, a circulator tube leading upwards from the collector into the steam space of the boiler, the upper end of the circulator tube being closed and a branch therefrom of smaller sectional area than the circulator tube also leading upwards into the steam space, the dip pipe being of smaller sectional areathan the circulator tube.

5. WVater-circulating apparatus for a steam boiler which is contained wholly within the boilerand is operated without the use of means external thereto, comprising an open-mouthed flared collector opening toward and located immediately adjacent.

circulator tube also leading upwards into the steam space.

6. Water-circulating apparatus for a steam boiler which is contained wholly within the boiler and is operated without the use of means external thereto, comprising an open-mouthed flared collector, located with-its mouth close to a furnace crown of the boiler, a d1p pipe extending upwardly from the dead water space into the collector and passing thereinto, a circulator tube leading upwards from the collector into the steam space ofthe boiler, the upper endv of being'of smaller sectional area than the circulator tube.

7'. lVater-circulating apparatus for a steam boiler which is contained wholly within the boilerand is operated Without the use of means external thereto, comprising an open-mouthed flared collector, located with 1t s mouth close to a furnace crownv of the boiler, a dip pipe extending upwardly from the dead water space into the collector and passing thereinto, a circulator tube leading upwards from the collector into the steam space of the boiler, a fluid-tight cap upon the upper end of the said tube, and

a branch from the circulator tube also leading upwards into the steam space, I In testlmony-whereof I aflix my'signature in presence of two witnesses.

ROBERT BROWN.

Witnesses:

STANLEY DUNLor, J. A. Goorc. 

